FMSLogo Code

Fix a typo.

Add the changes for 6.16.0.

Add some new tests, including tests for CASCADE. Also update to changes in Logolib (now they throw properly localized bad input errors).

Add a test for SETPENCOLOUR, SETSCREENCOLOUR, SETFLOODCOLOUR, PENCOLOUR, SCREENCOLOUR, and FLOODCOLOUR. These are only supported in the English version of FMSLogo.

Fix the "too many inputs" test, now that THROW has a form that takes more than three inputs.

Reformat the code to make it a little easier for me to read.

Replace "pu" with "penup" and "pd" with "pendown" because "pu" means something else on the Portuguese translation of FMSLogo.

Replace "se" with "sentence" because "se" means something else on the Portuguese translation of FMSLogo.

Also make some of the variables local to remove some of the clutter at the bottom of the file.

Replace "pu" with "penup" and "pd" with "pendown" because "pu" means something else on the Portuguese translation of FMSLogo.

Fix a UI annoyance where the rectangle that surrounded the message box was slightly crooked. Depending on how you look at it, this is a bug in the game or in FMSLogo. The problem is that the rectangle would start on a half-pixel. Due to rounding issues, drawing each length would sometimes go an extra pixel.

The fix is to process the X,Y coordinate with INT so that it never ends up being on a half-pixel.